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24#include <linux/input.h>
25#include <linux/usb.h>
26#include <linux/hid.h>
27
28#include "usbhid/usbhid.h"
29#include "hid-lg.h"
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58struct lg3ff_device {
59 struct hid_report *report;
60};
61
62static int hid_lg3ff_play(struct input_dev *dev, void *data,
63 struct ff_effect *effect)
64{
65 struct hid_device *hid = input_get_drvdata(dev);
66 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
67 struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
68 int x, y;
69
70
71
72
73
74 memset(report->field[0]->value, 0, sizeof(__s32)*report->field[0]->maxusage);
75
76 switch (effect->type) {
77 case FF_CONSTANT:
78
79
80
81
82 x = effect->u.ramp.start_level;
83 y = effect->u.ramp.end_level;
84
85
86 report->field[0]->value[0] = 0x51;
87
88
89
90
91
92 report->field[0]->value[1] = (unsigned char)(-x);
93 report->field[0]->value[31] = (unsigned char)(-y);
94
95 usbhid_submit_report(hid, report, USB_DIR_OUT);
96 break;
97 }
98 return 0;
99}
100static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude)
101{
102 struct hid_device *hid = input_get_drvdata(dev);
103 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
104 struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
105
106
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108
109
110
111 report->field[0]->value[0] = 0x51;
112 report->field[0]->value[1] = 0x00;
113 report->field[0]->value[2] = 0x00;
114 report->field[0]->value[3] = 0x7F;
115 report->field[0]->value[4] = 0x7F;
116 report->field[0]->value[31] = 0x00;
117 report->field[0]->value[32] = 0x00;
118 report->field[0]->value[33] = 0x7F;
119 report->field[0]->value[34] = 0x7F;
120
121 usbhid_submit_report(hid, report, USB_DIR_OUT);
122}
123
124
125static const signed short ff3_joystick_ac[] = {
126 FF_CONSTANT,
127 FF_AUTOCENTER,
128 -1
129};
130
131int lg3ff_init(struct hid_device *hid)
132{
133 struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
134 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
135 struct input_dev *dev = hidinput->input;
136 struct hid_report *report;
137 struct hid_field *field;
138 const signed short *ff_bits = ff3_joystick_ac;
139 int error;
140 int i;
141
142
143 if (list_empty(report_list)) {
144 hid_err(hid, "No output report found\n");
145 return -1;
146 }
147
148
149 report = list_entry(report_list->next, struct hid_report, list);
150 if (!report) {
151 hid_err(hid, "NULL output report\n");
152 return -1;
153 }
154
155 field = report->field[0];
156 if (!field) {
157 hid_err(hid, "NULL field\n");
158 return -1;
159 }
160
161
162 for (i = 0; ff_bits[i] >= 0; i++)
163 set_bit(ff_bits[i], dev->ffbit);
164
165 error = input_ff_create_memless(dev, NULL, hid_lg3ff_play);
166 if (error)
167 return error;
168
169 if (test_bit(FF_AUTOCENTER, dev->ffbit))
170 dev->ff->set_autocenter = hid_lg3ff_set_autocenter;
171
172 hid_info(hid, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n");
173 return 0;
174}
175
176